Composition comprising a polymer consisting of units derived from an unsaturated hydrocarbon monomer, a starchy material and a compatibilizing agent

Abstract

 This invention provides a composition, containing a polymer of unsaturated hydrocarbon, a C₁₋₄ alkyl or hydroxyalkylether of starch having a degree of substitution of at least 0.25 for improving the biodegradability and a vinyl or acryl polymer as a compatibilizing agent and a polyhydric aliphatic alcohol having 2-10 carbonatoms and 2-6 hydroxyl groups as a dispersant/plasticizer for the starch ether.

Description

[0001] This invention relates to a composition containing a polymer of unsaturated hydrocarbon, a C₁₋₄ alkyl or hydroxyalkylether of starch having a dregree of substitution of at least 0,25 and a vinyl or acryl polymer as a compatibilizing agent.

[0002] Dutch patent application 8902321, which is not a prior publication, discloses a composition which contains a polymer of unsaturated hydrocarbon and a C₁₋₄ alkyl or hydroalkyl starch ether having a degree of substitution of at least 0.25 for improving the biodegradability, and furthermore a compatibilizing agent. A vinyl or acryl copolymer is used as the compatibilizing agent, in particular a copolymer of ethylene and vinyl acetate (EVA) or a copolymer of ethylene and acrylic acid (EAA). In this way a relatively high percentage of starch derivative can be incorporated into the material. From these compositions objects and in particular packaging films can be made. According to said Dutch application it is preferred to add a higher carboxylic acid, such as stearic acid, oleic acid or di-oleic acid, as a plasticizer or lubricant; said carboxylic acid also acts as a dispersant.

[0003] According to this invention the present composition also contains a polyhydric aliphatic alcohol having 2-10 carbon atoms and 2-6 hydroxyl groups as a dispersant/plasticizer/lubricant for the starch ether. The alcohol has a better dispersing action than the carboxylic acid used in Dutch patent application 8902321. The alcohol provides better properties in terms of strength, elasticity and film forming, compared to the use of carboxylic acid as disclosed in Dutch application 8902321.

[0004] DE-A-1,470,846 discloses a combination of an alkyl or hydroxyalkyl starch ether, specifically a hydroxyethyl starch ether or a hydroxypropyl starch ether, having the abovementioned degree of substitution, an alcohol such as propylene glycol, diethylene glycol or glycerine as a plasticizer therefore, as well as water in an amount of 1-20 % by weight. However, this reference does not mention a hydrocarbon polymer or any other polymer to be used in combination with the starch derivative and therefore also a compatibilizing agent is not disclosed. Furthermore, in contrast to the present application, water has to be present according to this reference.

[0005] This invention also relates to a process for preparing such a composition, as well as to products which have been made by means of this composition or with the use of said process.

[0006] As in Dutch application 8902321, the polymers of unsaturated hydrocarbons to be used are in the first place polyolefins, such as the different kinds of polyethylene and polypropylene, and furthermore polystyrene, as well as copolymers of these unsaturated hydrocarbons; in particular ethylene polymers are used.

[0007] As in Dutch application 8902321, the degree of substitution of the etherfied starch should be at least 0.25 and preferably 0.4-1.0, while the preferred starch ethers are hydroxypropyl ethers, obtained by condensation of starch with propylene oxide. As is also disclosed in this reference, this condensation is preferably carried out using alkaline catalysis, in particular with NaOH, whereby a statistic distribution of the products occurs.

[0008] As in Dutch application 8902321, copolymers of ethylene and vinyl acetate (EVA) or of ethylene and acrylic acid (EAA) are preferably used as compatibilizing vinyl or acryl copolymers. Furthermore terpolymers of ethylene, vinyl acetate and (meth)acrylic acid can be mentioned.

[0009] Examples of the polyhydric alcohol used in this invention as dispersant/plasticizer/lubricant are ethylene glycol, propylene glycol, glycerine, butylene glycol, diethylene glycol, pentaerythritol and dipentaerythritol can be mentioned as such alcohols. Ethylene glycol, propylene glycol and pentaerythritol are preferred and of these compounds ethylene glycol is most preferred.

[0010] The present polyhydric alcohols are used in amounts which cause to swell or partially dissolve the starch ether and they should not be used in such a large amount that a complete dissolution is achieved. For example the preferred hydroxypropyl starch dissolves in ethylene glycol in an amount of 30 % at 75°C and in propylene glycol in an amount of 40 %, while this compound dissolves in glycerol in an amount of 10 % at 100°C.

[0011] Preferably 20-70 % by weight of polymer of unsaturated hydrocarbon, 20-80 % by weight of starch ether, 11-19 % by weight of compatibilizing copolymer and 2-8 % by weight of polyhydric alcohol is used in the composition of this invention.

[0012] Because processing the mixture always involves a heating step, the polyhydric alcohol can completely develop its swelling or partially dissolving action.

[0013] A preferred process for preparing the present composition comprises extruding together the starch ether and the polyhydric alcohol and thereafter mixing the thus obtained homogeneous mixture with the other components and extruding said mixture.

[0014] Although the invention is not dependant on or restricted by theoretical considerations, it is believed that the hydrogen bondings of the starch are disrupted by the etherification, whereafter the polyhydric alcohol causes a further disentanglement of the starch molecules, so that the starch particles are present independently of each other and can be substantially completely molecularly dispersed. Sometimes this leads to clear beads when the starch ether and the polyhydric alcohol are extruded together.

[0015] The composition of this invention is excellently suitable for the manufacture of films, but also of three-dimensional objects. Furthermore, starch ethers and the polyhydric alcohol used are cheap materials, cheaper than the hydrocabon polymer. A perfect composition containing 50 % of starch ether can be obtained easily and also higher percentages of starch ether are suitable. Of course the optimal percentage of starch ether will also depend on the use of the composition. The following non-limiting example illustrates this invention.

Example I

[0016] A mixture of hydroxypropyl starch having a degree of substitution of 0.5 and 10 % by weight of ethylene glycol, based on the starch, was extruded at 75°C and clear beads were thus obtained. 55 parts by weight of the beads were admixed with 15 parts by weight of EAA and 30 parts by weight of low density polyethylene (LLDPE). This mixture was extruded and films were made. These films had a tensile strength of 12.6 MPa/mm² (about 50 % of the value of LLDPE as such) and a yield value of 12.3 as compared to only 10.1 for polyethylene as such. Furthermore the film showed a elongation at break of 330 %. This combination of properties makes the film outstandingly suitable as packaging film, which has the additional advantage of being biodegradable .

Example II

[0017] Two mixtures A en B of linear low pressure polyethylene (LLDPE), hydroxypropyl starch (HPS) having a degree of substitution of 0.5 and EAA (ethylene acrylic acid copolymer) as a compatibilizing agent and stearic acid were prepared. The compositions of the mixtures are indicated in the table below. The mixtures were heated to 180°C in an extruder and extruded to form granulates and the granulates were made into films by extrusion-blowing. Composition A could not be made into a film. Furthermore, two mixtures C and D having the same compositions as A and B, respectively, except that these mixtures contained 5 parts by weight of glycol in stead of 5 parts by weight of stearic acid, were prepared and made into films according to the same procedure.

[0018] As appears from the above table, composition A, which contained stearic acid, could not be made into films, while composition C, which is identical to composition A except for the fact that C contains glycol instead of stearic acid, could be made into films having desirable properties.
Composition D, containing glycol, has a better balance of properties than composition B which differs from composition D in that B contains stearic acid instead of glycol.

Example III

[0019] The following 2 mixtures were prepared and made into films using the method of example II. The HPS, EAA and LLDPE were the same as in the previous examples.

Claims

1. A composition, containing a polymer of unsaturated hydrocarbon, a C₁₋₄ alkyl or hydroxyalkyl ether of starch having a degree of substitution of at least 0.25 and a vinyl or acryl polymer as a compatibilizing agent, characterized in that the composition also contains a polyhydric aliphatic alcohol having 2-10 carbon atoms and 2-6 hydroxyl groups as a dispersant/plasticizer for the starch ether.

2. A composition according to claim 1, characterized in that it contains an ethylene polymer as said hydrocarbon polymer.

3. A composition according to claim 1 or 2, characterized in that it contains a condensation product of starch and propylene oxide as said starch ether.

4. A composition according to claims 1-3, characterized in that the starch ether has a degree of substitution of 0.4-1.0.

5. A composition according to claims 1-4, characterized in that the compatibilizing agent is a copolymer of ethylene and vinyl acetate or acrylic acid.

6. A composition according to claims 1-4, characterized in that the compatibilizing agent is a terpolymer of ethylene, vinyl acetate and (meth)acrylic acid.

7. A composition according to claims 1-6, characterized in that the polyhydric alcohol is ethylene glycol, propylene glycol or glycerol.

8. A composition according to claims 1-9, characterized in that the composition contains 20-70 % by weight of polymer of unsaturated hydrocarbon, 20-80 % by weight of starch ether, 11-19 % by weight of compatibilizing agent and 2-8 % by weight of polyhydric alcohol.

9. A process for preparing a composition according to one or more foregoing claims, characterized in that the starch ether and the polyhydric alcohol are extruded together and thereafter the so obtained homogeneous material is admixed with the other components and this mixture is extruded.

10. Articles, manufactured by means of a composition according to claims 1-8 and with the use of the process according to claim 9, respectively.

Claims

Claims for the following Contracting State(s): ES

1. A process for preparing a composition containing a polymer of unsaturated hydrocarbon, a C₁₋₄ alkyl or hydroxyalkyl ether of starch having a degree of substitution of at least 0.25 and a vinyl or acryl polymer as a compatibilizing agent, characterized by incorporating into said composition also a polyhydric aliphatic alcohol having 2-10 car-bon atoms and 2-6 hydroxyl groups as a dispersant/plasticizer for the starch ether.

2. A process according to claim 1, characterized by using an ethylene polymer as said hydrocarbon polymer.

3. A process according to claim 1 or 2, characterized by using a condensation product of starch and propylene oxide as said starch ether.

4. A process according to claims 1-3, characterized by using a starch ether having a degree of substitution of 0.4-1.0.

5. A process according to claims 1-4, characterized by using a copolymer of ethylene and vinyl acetate or acrylic acid as said compatibilizing agent.

6. A process according to claims 1-4, characterized by using a terpolymer of ethylene, vinyl acetate and (meth)acrylic acid as said compatibilizing agent.

7. A process according to claims 1-6, characterized by using ethylene glycol, propylene glycol or glycerol as said polyhydric alcohol.

8. A process according to claims 1-7, characterized by preparing a composition containing 20-70 % by weight of polymer of unsaturated hydrocarbon, 20-80 % by weight of starch ether, 11-19 % by weight of compatibilizing agent and 2-8 % by weight of polyhydric alcohol.

9. A process according to claims 1-8, characterized in that the starch ether and the polyhydric alcohol are extruded together and thereafter the so obtained homogeneous material is admixed with the other components and this mixture is extruded.

10. Articles, manufactured with the use of the process according to claims 1-9.